review_1 - Steady balance for CV (single inlet...

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General Approach to Problem Solving • Sketch the process. Define your system. Label all known and unknown quantities. • Choose a model for the working substance. • Write down the mass balance equation. • Write down the energy balance equation. • Use specialized or combined forms as needed. Control volume or system Mass entering (1) Mass leaving (2) Q W
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Models of Working Substances Solid/ liquid Table A-3 C p = C v = C Gases Phase-change fluids refrigerants) Tables A-4 to 8 and A-11 to A-13 Mixtures (advanced) Perfect gas Pv = RT C p = constant C v = C p –R Table A-2a for C p . u = C v T, h = C p T . P and T are absolute. Ideal gas Pv = RT C p = f(T) Table A-2b,c. C v = C p –R Table A-17 to A-24 for u and h. P and T are absolute. Real gas Figures A-15 RT Pv Z v v ) P , T ( f Z actual ideal actual R R = = = c R c R P P P T T T = = P and T are absolute. = = T 0 v T 0 p dT C u dT C h This chart was inspired by Subrata Bhattacharjee, The Expert System for Thermodynamics , Prentice Hall, Upper Saddle River, NJ, 2003. ISBN 0-13-009235-5. www.thermofluids.net.
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Mass Balance
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Unformatted text preview: Steady balance for CV (single inlet & outlet) Balance for closed system Averaged flow out in CV m m dt dm = out in 1 2 CV m m m m m = = av av av v V v A A m = = = av av Vel Vel m m out in = m m out in = dt dm sys = m m m 1 2 sys = = Energy Balance Unsteady balance for CV (single inlet & outlet) Steady balance for CV (single inlet & outlet) Balance for closed system net , out net , in sys W Q dt dE = net , out net , in sys W Q E = gz 2 1 u e 2 + + = V 2 2 2 1 2 1 net , out net , in CV gz 2 h m gz 2 h m W Q dt dE + + + + + = V V 2 2 2 1 2 1 net , out net , in gz 2 h m gz 2 h m W Q + + + + + = V V...
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review_1 - Steady balance for CV (single inlet...

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